BlahDNS is nice, it's privately operated so uptime is not a guarantee but I have not had problems in years. Other than that, both Njalla and Mullvad provide DoH

BlahDNS is nice, it's privately operated so uptime is not a guarantee but I have not had problems in years. Other than that, both Njalla and Mullvad provide DoH services, they are pretty reputable in regards to user privacy